my wife has a 98 gt 4.6...i just put the k & n stage 2 system and saw a great change...next i just ordered headers and side pipes...some one mentioned something about changing a chip...can any body help me on this please...thanks migraine

Hey Migraine, the "chip" you are referring to is actually a module that plugs in between the ECM (the computer) and the wiring harness. It alters the information the ECM receives, kind of like tricking it. Generally they change the spark curve (more advance) and the fuel settings (leaner). They can also change the limits for rev limter, speed limiter and shift points, if its an automatic. Superchips and Diablo are just names that come to mind. Hope this helps. Tim.:s3

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